Question
A boat covers 36 km downstream in 3 hours and 24 km
upstream in 4 hours. Find the speed of the boat in still water and the speed of the stream.Solution
Downstream speed = 36/3 = 12 km/h Upstream speed = 24/4 = 6 km/h Let boat speed in still water = u, stream speed = v. u + v = 12 u − v = 6 Add: 2u = 18 ⇒ u = 9 km/h Then v = 12 − 9 = 3 km/h Answer: Boat speed = 9 km/h, Stream speed = 3 km/h.
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